Bio-Scru Design

At the heart of the Therma-Flite BIO-SCRU® sludge drying system is proven HOLO-SCRU® screw type heat exchanger technology. Screw type heat exchangers have been used in bulk processing for
the agriculture, chemical, construction, and food industries for over 70 years. This versatile system is capable of processing everything from Apples to Zinc. Both reliable and customizable, HOLO-SCRU® equipment is the world standard in indirect screw
type heat exchange equipment.

Technology that Works

Feed hopper

The feed hopper includes
twin, intermeshed paddle
mixers to keep the biosolids
homogenized and break
up bridging. This feature
insures a consistent feed rate
and material uniformity. A
screw auger located in the
bottom of the feed hopper
conveys the biosolids to the
dryer.

bio-scru dryer

The dryer chamber includes twin, intermeshed HOLO-SCRU® rotors.
In the drying chamber, biosolids are heated under slight negative
pressure in a sealed, anaerobic environment. The dehydrating heat
is indirect. Thermal fluid is circulated throughout the HOLO-SCRU®
rotor and outer jacket of the drying chamber.

scrubber/condenser

The condenser system provides the
continuous removal of moisture
evaporating from the biosolids. The
process captures particulate and
condenses the evaporated water.

cooling screw

The water-cooled screw
rotor and jacketed
housing combine to
cool the dried biosolids
for safe handling.

Optimum Volumetric Reduction and Efficiency

Through proprietary design, the BIO-SCRU® dryer reduces biosolid volume by decreasing capacity, or pitch, at
each stage of the rotor. This increases loading capacity and utilizes the maximum amount of heat transfer surface
A
through the length of the dryer. Biosolids are accumulated between each stage of the rotor in no-pitch zones
allowing the mixing blades to homogenize particle size. The rotor flights use wipers to remove material
adhering to the opposing screw. The self-clearing design of the rotors insures that heat transfer surfaces remain
free of build-up.

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Why IC Series BIO-SCRU Dryers are the Clear Choice

BIO-SCRU® dryers are built in
accordance with ASME code

Available in a variety of sizes

Each unit is custom-built by Therma-Flite, a world leader in bulk processing and heat
exchange equipment